I play HEE, I prefer it more as it's slower paced than WP and is more heavily statistic-based for breeding and showing (which can be partially automated, exploring cannot).
Horses age every month compared to just over a week and a bit here. I don't have the RL time to devote to this game as I work 7-on-7-off rostered work and I get frustrated with myself that the wolves fall behind what my expectations are for them.
I can't say I interact with many people on either HEE or here though, but I'd probably prefer HEE as it seems like there are more adults and that's the preferable age group I'm comfortable interacting with.
I'm also super into genetics and HEE's realistic genetics are fascinating, WP doesn't have the same workings.